Per westin



UNITED STATES PATENT OFFICE,

PER WESTIN, 0F sTocxHoLM, swcenmv.

rnoonss or GONCENTRATING SOLUTIONS.

No Drawing.

To all whom it may concern:

Be it known that I, Pnn \VnsTIN, engineer, subject of the King of Sweden residin at fi l Sturegatan, Stockholm, Sweden, have invented certain new and useful Improvements in Processes of Concentrating Solutions, of ,1

'whlch have a higher percentage of sugar,

which the following is a specification.

The present invention relates to a method 01 recovering organic and inorganic constituents of solutions,particularly waste liquors from sulfite mills and from factories in which alcohol is produced from such liquor. The invention comprises especially mixing the liquor with a suitable absorbent mate rial, which also may be carbonizable, such as refuse wood, moss-litter, etc. This mixing can be done by floating the absorbent in the liquors treated. After this the mixture is dried. The drying having proceeded so far that the absorbent is capable of absorbing more liquor, the same is mixed. Or floated with an additional quantity of the liquor.

. In this way the process is continued until the tained therein, for instance in the process of producing alcohol therefrom. The absorbout, after pressing, which always contains a certain quantity of the ingredients of the sulfite liquor, is again saturated with new liquor, whereupon it is again squeezed out after having been completely saturated;

These operations may be repeated, until the absorbent has been so impregnated with the solid matter contained in the liquor that it cannot absorb any further considerable quantity of liquor. The absorbent is now formed into briquets which, upon drying, e mstitute an excellent fuel which maybe advantageously coked, such operation producing a very high yield of lay-products. If it is only desired to produce alcohol and solid fuel, the saturation of the squeezed absorbent is effected with the residuary liquors from the alcohol manufacturing lant. As absorbing material, finely divided refuse wood, such. as bark, etc., as well as peat-litter, peat-dust, broken charcoal, coal, ordinary coke or the coke of the sulfite briquets produced, may be used, or other suitable absorbents can be employed. Other Specification of Letters Patent. Patented Sept. 9, 1919. Application filed February 28,1919. Serial no. 279,890.

waste liquor, or waste water also, for i11- stance the liquors or waters from sugar mills maybe enrichedin this manner for the purpose of recovering the valuable substances contained therein. we 1w ,lVhen usingbark refuse of those varieties tannins, etc., than does ordinary wood, part of these easily soluble substances are dissolved. The liquor squeezed out from the partly dried absorbent, therefore, contains 7 partly by its adhesiveness, by which it tends to adhere to the absorbent mass. The squeezed out enriched liquor, therefore, constitutes a more valuable raw material, than does the raw liquor, for the production of such products as alcohol from sulfite liquor or tanning extract from sulfite liquor.

The invention may also be advantageously applied to various solutions other than waste liquors, for instance in the concentrating of salt solutions from sea water.

I claim:

1. A method of concentrating solutions, whichcomprises alternately mixing an absorbent material with the solution, and drying the mixture, and repeating the said op liquors with an organic absorbent material,

drying the mixture, repeating said operations until a desired quantity of the liquor Waste Wood pulp liquor with an organic combustible absorbent material, drying the mixture, and repeating such operations until altered Wood pulp liquor organic solids, such binder containing substantially less percent- 15 age of the readily soluble solids of the Wood pulp liquor than does the original Waste Wood pulp liquor, such binder being in a non-charred condition.

In testimony whereof I affix my signature 2 in presence of two Witnesses.

PER WESTIN.

Witnesses OSCAR GRAI-IN, JACOB BAGGE.

Copies of this patent may, be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

